Jason O'Byrne - 08 Feb 2022 Form 4 Insider Report for Caribou Biosciences, Inc. (CRBU)

Role: Chief Financial Officer
Signature: /s/ Barbara G. McClung, as attorney-in-fact
Issuer symbol: CRBU
Transactions as of: 08 Feb 2022
Net transactions value: +$100,021
Form type: 4
Filing time: 08 Feb 2022, 18:27:09 UTC
Previous filing: 21 Dec 2021
Next filing: 23 Feb 2023
SEC: View on sec.gov

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	CRBU	Common Stock	Options Exercise	$100,021	+24,336		$4.11	24,336	08 Feb 2022	Direct

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	CRBU	Option to purchase Common Stock	Options Exercise	$0	-24,336	-5.6%	$0.000000	412,865	08 Feb 2022	Common Stock	24,336	$4.11	Direct	F1

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	1/4th of the shares subject to this option vested on February 8, 2022 and an additional 1/48th of the aggregate number of shares subject to the option will vest on the corresponding day of each month thereafter until the option is fully vested on February 8, 2025, subject to the reporting person's continued services to the Issuer through the applicable vesting dates.